Move installed drive to another UEFI machine

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I installed RHEL 7.6 on an SSD in a Dell Precision 7810. The installer added it to the UEFI boot sequence and it worked OK. I removed the drive and mailed it to a coworker who has an identical machine. We plugged the drive into SATA port 2 on the second machine, leaving the original windows 10 drive on port 0. This second machine sees the drive in the BIOS but we can't find the EFI partition in the Boot Sequence/Add Boot Partition dialog. What do we need to do to get it to boot from the RHEL SSD?
Thanks,
Allen

AB

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